Mathematics – Number Theory
Scientific paper
2010-12-14
Mathematics
Number Theory
Scientific paper
Given a finite index subgroup of $SL_2(\mathbb Z)$ with modular curve defined
over $\mathbb Q$, under the assumption that the space of weight $k$ ($ \ge 2$)
cusp forms is $1$-dimensional, we show that a form in this space with Fourier
coefficients in $\mathbb Q$ has bounded denominators if and only if it is a
congruence modular form.
Li Wen-Ching Winnie
Long Ling
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